Knockdown carpenter&#39;s square.



A. A. HARIE.

KNOGKDOWN GARPBNTEES SQUARE.

APPLICATION, FILED MAR.2. 1912.

Patented Dee. 31, 1912.

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lo rn ya ALBERT A. HARVIE, or OTTUMWA, IOWA.

KNOCKD OWN CARPENTER S S QUARE.

To all whom it may concern.:

Be it known that I, ALBERT A. HARVE, a citizen of the UnitedStates,residing at Ottumwa,rin the county of l/Vapello and State of Iowa,'haveinvented certain new and useful Improvements in Knockdown CarpentersSquares, of which the following is a specication. Y

This invention relates to a knock-down carpenters square; that is to acarpenters square, in which the blade and tongue are made separate, butin which means are provided for joining them together and securing themat right angles to each other.

The application has particular reference to that class ofknockdown.square, in which the tongue and blade each constitutespractically a straight piece of material, so that the two parts can beeasily packed into a carpenters kit, and can be easily manufactured.

The present inventionhas reference particularly to the means for joiningthe tongue and blade together. For this purpose, I desire to provide alocking arrangement, so that by tightening a single screw or nut the twoelements will be rigidly joined together at exactly the proper angle.-

Other objects and uses will appear from a detailed description of theinvention which consists in the features of construction and combinationof parts hereinafter described and claimed.

In the drawing, Figure l shows a face view of the corner of the square,the tongue and blade being locked together; Fig. 2 shows a face view ofthe end of a tongue disengaged from the blade; Fig. 3 shows a face viewof the end of the blade disengaged from the tongue; Fig. 4 is a sectiontaken on the line 4 4 of Fig. 1, looking in the direction of the arrows;and Fig. 5 is a section taken on the line of Fig. l, also looking in thedirection of the arrows.

In the drawings, the numeral 6 designates the blade of the square, andthe numeral 7 designates the tongue. In the construction illustrated, Ihave shown the locking member as being applied to the tongue, and otherelements being correspondingly formed. It will soon be apparent,however, that the arrangement might be reversed, and that it is notnecessary that the locking member should be applied to the tongue. Inthe construction illustrated, Va channel 8 is formed across the blade,the same having its Specication of Letters Patent.

Application iield March 2, 1912. Serial No. 681,138.

Patented Dec. 31,1912.

side walls 9 and `10 beveled outwardly to receive the edges of the endof the tongue. A notch 11 is cut in from the outer edge of the blade,the same having its edge 12 beveled at an acute angle to the channel ofthe blade. There 1s provided a channel 13 across the face of the tongue,the edge 14C of said channel being undercut to match up with the edge l2of the blade. The end portion 15 of the tongue is of proper size to seatnicely into the notch l1. The edges 16 and 17 of the tongue should bebeveled to seat accurately against the faces 9 and l0 of the channel inthe blade, and to make tight contact with them before the faces of thechannels in the tongue and blade come together. It is preferred alsothat the edge 18 of the blade should Vbe undercut slightly, the edge 19of the tongue being cut at a similar angle.

By forming the parts as above stated, and proportioning them .insubstantially the vmanner stated, when the locking screw is tightened itwill tend to wedge the blade over sidewise to bring its edge l2 tightlyagainst the edge 14 ofthe tongue. Also by reason of the bevel on thehead of the screw, the side of the blade adjacent the screw will be-downtoward the tongue so as to seat the `side walls 9 and 10 of the bladetightly and squarely against the edges 16 and 17 of the tongue.

I provide a locking device for holding the two elements together afterthe tongue has been hooked into the blade. The preferred construction,that illustrated, comprises a headed screw 20 threaded into the tongue,and having its head 21 of a size to overlie a portion of the blade. Itis preferred that this head should be beveled, as shown in Fig. 5, sothat by threading the screw tightly into place the elements will bedrawn together, and at the same time there will be a tendency to forcethe blade sidewise so as to insure a tight contact between the edges 12and 14. A notch 22 should preferably be formed in the blade to receivethe overlying portion of the screw. In order to permit the square to beknockeddown without having to completely Withdraw the screw, the head ofthe latter may be cut away in the portion 23, so that by rotating thescrew into the position shown in Fig. 2, the blade can be unhooked fromthe tongue.

As before stated, it is not necessary that the locking member should beapplied to to engage the tongue, ment might in this case other Words,the tongue, and the element 7 the blade.

I claim: a

l 1. In a knockdown carpenters square, the combination of a blade havinga channel extending across one of its faces, and having the side Wallsof the channel outwardly beveled, and having the edge of the .channelbeveled at an -aoute angle to the n face thereof, a tongue having achannel extending across the complementary face thereof, and having theedges o-f the tongue beveled to correspond to the side Walls of thechannel of the blade, and having the edge of the'channel of the tongueundercut the edge of the channel of the means for locking the tongue andblade together adjacent one edge of the the tongue being of the channelof the blade that the edges of the tongue enthe' edges of the bladechannel before faces of the channels come into conblade, and

channel of the tongue, such Width With respect to gage the tact,substantially as described.

' 2. In a knock-down carpenters square, the combination of a bladehaving a channel extending across one facey thereof, and having one edgeof the blade beveled at an acute angle to the face of the channeltherehaving a channel extending across the complementary face thereof,and

of, a tongue Copies of this patent may be obtained for as it is obviousthat the arrange-y be reversed, the locking member being appliedy to.the blade. InV the element 6 might be called having one edge Vof saidchannel undercut "to Aengage the acute edge of the blade, and a headedscrew onV the tongue having the head thereof overlying the adjacent edgeof the blade and adapted When threaded 'cinto place to draw the tongueand blade together and the acute edgethereof into rm engagement vWiththe undercutedge of the tongue channel, substantially as described.

3. In a knockdovvn carpenters square, the combination of a'blade havinga chanan acute angle to the face of the channel thereof, a tongue havinga channel extending across the complementary face thereof, and havingone edge of the channel of the ALBERT A. Haavm.

Witnesses EMMET A. WORK, E. J. WORK.

ve cents each, by addressing the Commissioner of Patents,

Washington, D. C.

force the blade sidewise to bring nel extending across one face thereof,and having one edge of the blade extending at tongue undercut to engagethe acute edge

